Improvement in pulley-block



@niet mes ,1. W. NORCROSS, 0F BOSTON, MASSACHUSETTS.l

Letters' Patent No. 73,030,dated January 7, 1868. l

IMPROVEMENT .IN PULLEY-BLOGK.

TO ALL WHOM IT MAY CONCERN:-

Be it known that I, I. W. Noncnoss, of Boston, in the county ofSu`olkState of' Massachusetts, have invented a new, and usefulPulley-Block; and' I do hereby declare that the following is a full,clear, and exact description thereof, which will enable thoseskilled inthe art Eto make and use the same, reference being had tn theaccompanying drawing, forming part of this specification, in which'drawing- Figure 1 is an edge view of a pulley-block containing aportion of my improvement.

Figure 2 shows my method of forming the eye in casting it. l

Figure 3 is anedge view of a double block. l

Figure i-is a side elevation of .a section in the plane of the line 1:z, fig. 3.

Figure 5 is a vertical section of a block, the axle of whose pulley runson anti-friction rollers.

Figure 6 is a top view of a double block, showing the hollow partition,provided to receive an anti-friction roller, and to allow the eye-strapto pass through from top to bottom. A

Figure 7 is a section ofthe last Jfigure, taken in the plane of the liney y, and the same is intended to show how the sides o' the hollowpartition are cut away or removed'to receive the eye-strap. l

Similar letters indicate corresponding parts.

This invention relates to pulley-blocks, and consists, among otherthings, in forming the cheeks or sides thereof, and the studs which jointhem to each other, by casting'them in separate pieces, and in-a novelmode of making the eyes by which the hooks of the block nreattached toit, and in a novel arrangement for relieving the axleof the pulley offriction. The other novel features will be explained as the descriptionproceeds.

The letter A, in the several gures, designates the block, .and theletter B its pulleys. The letter C designates the cheeks of the block,which I cast of any desired size and shape, from malleable iron orbrass, each cheek being made independent of' and separate from theother, and also independent of the studs and of the other parts of theblock.

In making up the block, the cheeks are brought opposite each other, thepulley being placed between them, with theends of its axle resting inbearings in` the cheeks. I c onnect the cheeks lto each other by meansof studs, which` are interposed at the top and bottom of the block,through which studs are placed rivets that go also through'the cheeks,and are riveted to them in the usual manner. In iig. 1 these studscomposeV part of theeyes D, by means ot' which the block is connected toa hook or other' attachment. The lower stud E is part of the lower eyeD, both being cast in one piece; and the upper stud E is likewise partof the upper eye D; but the upper stud E is made iu two divisions incasting, so as to allow the eye of hook F to be interlocked with it. Thehook F, having an eye at the end of its shank, as usual, is madeseparate and independent of the upper stud and eye D E; and -in orderto-interlock-.them, I cast the said upper stud in a. divided state,pursuing the following method, observing iig. 3: In said figure the studis seein with its divisions separated,'as they4 appear in the mould, theletters Gc Gr designating the core-pins for making the rivet-holes.After the casting is' completed, the eye of hook F, or of whatever otherattachment is to b e used, is in'terlocked with the eye D, and thedivisions of the stud are brought together. v

This method of making the stud can be applied and used also when a hookor swivel is combined with the stud. It is obvious that one-half of eachstdd 4and bearing may be connected with the side; but as in 'that Aeasethe hodk "could not be inserted, I propose' to cast' each and all partsseparate and independent of each other.

In fig. 3, I have shown a. pulley-block that has two pulleys, B,separated by a partition, H, whose top is confined between the divisionsof the divided upper stud E, and its bottom between the lower studs E E.When e lower eyo is used, the said partition H is held between thedivisions of the stud in the manner shownin the top of the block, thestud, in that case, being made in divisions.

The partition H, gs. 3 and 4, is not solid, but consists of u.skeleton-plate, of the proper outlines to form the exterior of theblock, und to furnish bearings for the axles of anti-t`riction rollers,when the latter are employed. I make the exterior cheeks C also in thesame manner, of skeleton or open-work plates, to obtain lightness, andto effect u. saving of material. Y

The axle or axles of the pulley or pulleys run on anti-"friction rollersI I, which are arranged, in the example shown in iig. 5, below thepulley-axles. This figure is a vertical section of e block, thesides-ofwhose upper eye, D, are extended downwardsso as to form straps'IiKoutside of the cheeks C C, and fit in grooves formed by ribs J J, thelower parts of said straps K taking the form of plates, in which theends of' the pulleyaxles have bearings as well as'the outer ends of theanti-friction rollers I, the inner ends of the axles of the latterhaving their bearings in the cheeks VC C. The lower ends of the strapsor platesfK are supported upon 4and held out from the cheeks by smallstuds E E, which are attached to the cheeks C, and straps or plates K,

by rivets. The cheeks C are ca st with ribs J'uponvthem.

- When more than one pulley is used in a block, I provide a1iti-frictionrollers for the inner cndsalso of their axles; and in order to obtain aplace for them, I make the partition H hollow. The mode of constructionwhich I have adopted in this example is by casting the same in twoparts, each part having a rim raised at right'angles to its sides, sothat when the two parts are brought together, the rims pointing inwards,a hollow partition is produced.

In fig. 6, I show, in top View, an example o f a partition of thisconstruction, its parts beingheld togetherY by the rivets which gothrough the outer cheeks andthe studs E. The top of the partition has anopening, L, through which is inserted the shank of the top eye of theblock; andthe bottom of the partition has a like opening to let thelower end of the shank of the said eye go through. t

The sectional side elevation, fig. 7, shows the exterior of one side of4partition II, andiit also shows, inredl outline, the openings which aremade in its sides to give' room for the forks, into which theshank of4the eye is divided, to pass downeach side of the anti-friction roller,which is to be placed within the partition, the said forks being bentout so as to occupy the Vsaid openings, at which place they furnishbearings for the axles of the pulleys and of the said anti-frictionrollers. 4 I

Inlarge blocks I put anti-friction rollers on either side of the axlesof the pulleys, but I have not thought it necessary to show an exampleof that arrangement as it is embraced in the principle of my invention,and the skillful mechanic will not need any further explanation toenable him to apply such additional rollers.

My invention enables me to produce a pulley-block of better character,more easily made, and much cheaper than those heretofore known. It willbe observed that I round off the edges of the hollow partition, so asnot to present sharp edges to the ropes.

What VI claim as new, and desire to secure by Letters Patent, is

1. In pulley-blocks, making the several cheeks byrcasting themindependeutlyand separate from the other parts, substantially asdescribed. l

The cast studs E, interposed between the cheeks, and held thereto byrivets or other suitable fastenings, 'substantiallyas described. i

3. Dividing the stud E, and combining the same with the eye D,substantially as described.

4. The skeleton partition or cheek H, substantially as described.

5. Arranging anti-friction rollers I beneath the axles of the pulley,substantially as above dscribed, in combination with a pulley-block ofany form or construction. Y

6. The hollow partition- H, made substantially as described, for thcpurpose o f containing an antifriction roller, one or more, to supportthe axles of the pulleys, and to form a recess for the shank of the eye.

This specification signed by me, this 15th day of November, 1867. Y

I. W. NORCROSS.

Witnesses:

W. HAUFF, Gusmv BERG.

